# Automatic handling of unknown words

Speechace returns the error code `error_unknown_words` for terms not found in its lexicon. To avoid this error and allow Speechace to automatically determine the phonetic mapping for unknown terms, include the `include_unknown_words` parameter in the request body.

Pass the following form-data parameter:

```json5
include_unknown_words=1
```


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://api-docs.speechace.com/guides-on-common-topics/automatic-handling-of-unknown-words.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.